PopUps: Maggie Gyllenhaal Has No Clue Where Taylor Swift's Scarf is

Stopping by "Watch What Happens Live" with Andy Cohen to promote her new HBO show "The Deuce," Maggie Gyllenhaal was asked about Taylor Swift's scarf. Something she clearly has no idea about.

Backstory: When the old Taylor Swift wasn't dead in 2012, she released her excellent album "Red," which features a power balled called "All Too Well" that's rumored to be about then boyfriend Jake Gyllenhaal, Maggie's brother. The song opens up with the lyrics: "And I left my scarf there at your sister's house / And you've still got it in your drawer even now." Many Taylor interpreters believe the sister in the song is Maggie Gyllenhaal.

A fan emailed into Cohen's show, asking, "Is it true Taylor Swift left her scarf at your house once?"

"You know, I never understood why everyone asked me about this scarf," a charming but confused Maggie says.

After Cohen explains the backstory to her and Maggie responds:

"I am in the dark about the scarf. It's totally possible I don't know. But I've been asked this before and I've been like, 'What are you talking about?'"

"I feel like you need to look for the scarf and put it on eBay," Cohen says.